A. Each dot was addressed using a Cartesian (x,y) coordinate system. For each dot serving as a boundary marker, its position was made known by flashing it just once for 50 microseconds. B. At TT = 0, dots that marked the boundary were flashed simultaneously . However, at TT = 100, 300, and 700 milliseconds dot positions were selected at random and flashed one at a time. For a given shape, the interval between successive dots, i.e., the SOA, was the total time provided for display of all dots divided by the number of dots for that shape. C. Successive display of dots is indicated, with the dashed portion at the right of the sequence meaning to represent random choices of dots until all have been flashed. The final dot at the right of the sequence meant to represent random choices of dots until all were flashed.